
Proceedings Paper
ZERODUR iso-grid design of a 3m class light weighted mirror blank for the E-ELT M5Format | Member Price | Non-Member Price |
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Paper Abstract
The tip and tilt M5 mirror of the European Extremly Large Telescope (E-ELT) requires a demanding approach in light
weighting. The approximately 3 m x 2.5 m elliptical plano mirror is specified to a weight of less than 500 kg with high
Eigenfrequencies and low deformation under different inclination angles.
In 2011 SCHOTT has presented a study to develop a design for the M5 mirror blank of the ESO E-ELT. The design
presented was based on a radial square design to achieve the best compromise between performance and
manufacturability. With the fabrication of a prototype section SCHOTT demonstrated its capability to manufacture the
demanding features including pockets with 350 mm depth, thin walls and sloped pocket bottoms.
Now 3 years later SCHOTT presents an iso-grid based design that is in accordance with the manufacturability progress
that has been demonstrated in various ELZM (Extremely Lightweighted ZERODUR Mirrors) publications in the last two
years. The achievements on the specified mechanical parameters are compared to the first approach from 2011. In this
paper the results are presented and the performance parameters are discussed.
Paper Details
Date Published: 18 July 2014
PDF: 11 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510H (18 July 2014); doi: 10.1117/12.2054929
Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)
PDF: 11 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510H (18 July 2014); doi: 10.1117/12.2054929
Show Author Affiliations
Volker Seibert, SCHOTT AG (Germany)
Thomas Westerhoff, SCHOTT AG (Germany)
Thomas Westerhoff, SCHOTT AG (Germany)
Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)
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